Managing Device Awake State

Dependencies and prerequisites

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When an Android device is left idle, it will first dim, then turn off the screen, and
ultimately turn off the CPU. This prevents the device's battery from quickly getting
drained. Yet there are times when your application might require a different behavior:

Apps such as games or movie apps may need to keep the screen turned on.

Other applications may not need the screen to remain on, but they may require the CPU
to keep running until a critical operation finishes.

This class describes how to keep a device awake when necessary without draining
its battery.